1. (Myth.) The principal goddess worshiped by the Egyptians. She was
regarded as the mother of Horus, and the sister and wife of Osiris. The
Egyptians adored her as the goddess of fecundity, and as the great
benefactress of their country, who instructed their ancestors in the
art of agriculture.
2. (Zoöl.) Any coral of the genus Isis, or family Isidæ, composed of
joints of white, stony coral, alternating with flexible, horny joints.
See Gorgoniacea.